I don't think that's true. AFAIK, the anonymous listings are usually companies that haven't publicly launched yet and don't want to burn through their TechCrunch coverage early. It's PR, not HR. I do agree, though, that they're kind of annoying to read and I have trouble imagining what kind of desperate souls apply to these employment-roulette positions.
It's not the anonymity that is bothersome, they're just horribly written job posts. And worse still: comments are disabled so we can't ask any further questions.
If an organization expects me to send a detailed resume to them without knowing the first thing about them, that starts the entire relationship off in a profoundly asymmetrical way.
